FO... The only Classic(3-12x50)I have ever used was an old school one when Holland first came out with his ART reticle back in the day... I remember having issues getting it zero'd due to the lack of travel in the erector.... Once I had the mount situation figured out it lived a long life on a 300 WM Sendero... Of course I never dialed for shots with it and in the 4 or so years I had it I never had to re-zero other than the 5 times I changed barrels on that particular rifle... It seemed solid IMO.... That is only a sample of one naturally...